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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>导航栏加下拉菜单</title>
    <frameset rows="7%,93%" frameborder="0">
        <frame src="head-nav.html" noresize="noresize">
    <frameset cols="16%,85%" frameborder="0">
        <frame src="left-nav.html">
        <frame src="intro-platform.html" name="view_frame">
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    </frameset>
</head>
</html>